1 /*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/slab.h>
35 #include <linux/export.h>
36
37 #include "mlx4.h"
38
39 struct mlx4_device_context {
40 struct list_head list;
41 struct mlx4_interface *intf;
42 void *context;
43 };
44
45 static LIST_HEAD(intf_list);
46 static LIST_HEAD(dev_list);
47 static DEFINE_MUTEX(intf_mutex);
48
mlx4_add_device(struct mlx4_interface * intf,struct mlx4_priv * priv)49 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
50 {
51 struct mlx4_device_context *dev_ctx;
52
53 dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
54 if (!dev_ctx)
55 return;
56
57 dev_ctx->intf = intf;
58 dev_ctx->context = intf->add(&priv->dev);
59
60 if (dev_ctx->context) {
61 spin_lock_irq(&priv->ctx_lock);
62 list_add_tail(&dev_ctx->list, &priv->ctx_list);
63 spin_unlock_irq(&priv->ctx_lock);
64 } else
65 kfree(dev_ctx);
66 }
67
mlx4_remove_device(struct mlx4_interface * intf,struct mlx4_priv * priv)68 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
69 {
70 struct mlx4_device_context *dev_ctx;
71
72 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
73 if (dev_ctx->intf == intf) {
74 spin_lock_irq(&priv->ctx_lock);
75 list_del(&dev_ctx->list);
76 spin_unlock_irq(&priv->ctx_lock);
77
78 intf->remove(&priv->dev, dev_ctx->context);
79 kfree(dev_ctx);
80 return;
81 }
82 }
83
mlx4_register_interface(struct mlx4_interface * intf)84 int mlx4_register_interface(struct mlx4_interface *intf)
85 {
86 struct mlx4_priv *priv;
87
88 if (!intf->add || !intf->remove)
89 return -EINVAL;
90
91 mutex_lock(&intf_mutex);
92
93 list_add_tail(&intf->list, &intf_list);
94 list_for_each_entry(priv, &dev_list, dev_list)
95 mlx4_add_device(intf, priv);
96
97 mutex_unlock(&intf_mutex);
98
99 return 0;
100 }
101 EXPORT_SYMBOL_GPL(mlx4_register_interface);
102
mlx4_unregister_interface(struct mlx4_interface * intf)103 void mlx4_unregister_interface(struct mlx4_interface *intf)
104 {
105 struct mlx4_priv *priv;
106
107 mutex_lock(&intf_mutex);
108
109 list_for_each_entry(priv, &dev_list, dev_list)
110 mlx4_remove_device(intf, priv);
111
112 list_del(&intf->list);
113
114 mutex_unlock(&intf_mutex);
115 }
116 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
117
mlx4_dispatch_event(struct mlx4_dev * dev,enum mlx4_dev_event type,int port)118 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, int port)
119 {
120 struct mlx4_priv *priv = mlx4_priv(dev);
121 struct mlx4_device_context *dev_ctx;
122 unsigned long flags;
123
124 spin_lock_irqsave(&priv->ctx_lock, flags);
125
126 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
127 if (dev_ctx->intf->event)
128 dev_ctx->intf->event(dev, dev_ctx->context, type, port);
129
130 spin_unlock_irqrestore(&priv->ctx_lock, flags);
131 }
132
mlx4_register_device(struct mlx4_dev * dev)133 int mlx4_register_device(struct mlx4_dev *dev)
134 {
135 struct mlx4_priv *priv = mlx4_priv(dev);
136 struct mlx4_interface *intf;
137
138 mutex_lock(&intf_mutex);
139
140 list_add_tail(&priv->dev_list, &dev_list);
141 list_for_each_entry(intf, &intf_list, list)
142 mlx4_add_device(intf, priv);
143
144 mutex_unlock(&intf_mutex);
145 if (!mlx4_is_slave(dev))
146 mlx4_start_catas_poll(dev);
147
148 return 0;
149 }
150
mlx4_unregister_device(struct mlx4_dev * dev)151 void mlx4_unregister_device(struct mlx4_dev *dev)
152 {
153 struct mlx4_priv *priv = mlx4_priv(dev);
154 struct mlx4_interface *intf;
155
156 if (!mlx4_is_slave(dev))
157 mlx4_stop_catas_poll(dev);
158 mutex_lock(&intf_mutex);
159
160 list_for_each_entry(intf, &intf_list, list)
161 mlx4_remove_device(intf, priv);
162
163 list_del(&priv->dev_list);
164
165 mutex_unlock(&intf_mutex);
166 }
167
mlx4_get_protocol_dev(struct mlx4_dev * dev,enum mlx4_protocol proto,int port)168 void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
169 {
170 struct mlx4_priv *priv = mlx4_priv(dev);
171 struct mlx4_device_context *dev_ctx;
172 unsigned long flags;
173 void *result = NULL;
174
175 spin_lock_irqsave(&priv->ctx_lock, flags);
176
177 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
178 if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
179 result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
180 break;
181 }
182
183 spin_unlock_irqrestore(&priv->ctx_lock, flags);
184
185 return result;
186 }
187 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);
188